Glad you got it fixed. Great to see these forums work.
But, Darn, now I can't give my speech about cheap plastic faucets. LOL
They can break in mysterious ways, especially through a winter.
I was convinced the problem was at or near the faucet, with water being supplied to filter. They are usually tapped off the cold line to faucet and usually no shutoffs.
It's best to remove aerator before turning water back on. Clean and replace after flushing.
Filters should be removed when winterizing. I'm looking for a replacement for mine. My cartridge had charcoal in it. Messy when they burst.
1999 GS Sun Voyager/Sport? F53 V-10 34' .. Home
1987 Barth Regal SE P30 454 34' .. For Sale